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  <a name="EN-US_TOPIC_0000002164828390"></a><a name="EN-US_TOPIC_0000002164828390"></a>
  <h1 class="topictitle1">What Should I Do If SAP HANA Backup or Restoration Jobs Fail Because the Number of I/O Channels Is Too Small</h1>
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    <h4 class="sectiontitle">Symptom</h4>
    <p>SAP HANA backup or restoration jobs of the general database fail because the command execution is abnormal.</p>
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    <h4 class="sectiontitle">Possible Cause</h4>
    <p>The initial number of I/O channels is too small. As a result, after a large number of SAP HANA backup or restoration jobs are executed, the channels are used up and the jobs fail.</p>
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    <h4 class="sectiontitle">Procedure</h4>
    <ol>
     <li><span>Use PuTTY to log in to the host where the client used for running the current job is installed.</span><p></p><p>The IP address of the host where the client is installed is the IP address displayed in the sub-job information. (You can view the IP address on the <strong>Jobs</strong> page of the OceanProtect WebUI.)</p> <p></p></li>
     <li><span>Run the following command to open the configuration file:</span><p></p><pre class="screen">vim /etc/sysctl.conf</pre> <p></p></li>
     <li><span>Check the value of <strong>fs.aio-max-nr</strong>. If the value is far less than <strong>18446744073709551615</strong>, change the value to <strong>18446744073709551615</strong>.</span></li>
     <li><span>After modifying and saving the configuration file, run the <strong>sysctl -p /ect/sysctl.conf</strong> command for the configuration to take effect.</span></li>
     <li><span>Initiate backup or restoration jobs again.</span></li>
    </ol>
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     <strong>Parent topic:</strong> <a href="en-us_topic_0000002164828418.html">FAQs</a>
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